Delhi’s post-Diwali smog pushes Delhi near severe AQI, with spikes across major Indian cities and Stage III GRAP restrictions in effect. A thick blanket of smog enveloped several parts of Delhi in the early hours of Monday, a day after Diwali, as the national capital's air quality deteriorated to the ‘severe’. Delhi pollution after Diwali worsens as thick smog blankets the capital.